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Effects of Landscape, Soils, and Weather on Yields, Nitrogen Use, and Profitability with Sensor-Based Variable Rate Nitrogen Management in Cotton
Agronomy ( IF 3.949 ) Pub Date : 2020-11-25 , DOI: 10.3390/agronomy10121858
James A. Larson , Melissa Stefanini , Xinhua Yin , Christopher N. Boyer , Dayton M. Lambert , Xia Vivian Zhou , Brenda S. Tubaña , Peter Scharf , Jac J. Varco , David J. Dunn , Hubert J. Savoy , Michael J. Buschermohle

Farmers may be reluctant to adopt variable rate nitrogen (VRN) management because of uncertain profits. This study assessed field landscape, soil, and weather effects on optical sensing (OS)-based VRN on cotton (Gossypium hirsutum L.) N rates, yields, and net returns (NRs). Field data were collected from 21 locations in Louisiana, Mississippi, Missouri, and Tennessee, USA, between 2011 and 2014. Data included yields, N rates, and NRs for the farmer practice (FP), OS-based VRN, and OS-based VRN supplemented with other information. Production data were augmented with landscape, soils, and weather data, and ANOVA and logistic regressions were used to identify field conditions where VRN was profitable, provided risk management benefits, and improved N efficiency. Key findings indicate that NRs were improved with VRN by applying additional N on more erodible soils. Higher organic matter soils also benefited from VRN through enhanced yields and NRs. VRN may also have provided risk management benefits by providing a lower probability of NRs below NRs for the FP on soils associated with greater water-holding capacity, higher organic matter levels, or deeper profiles. Results from this study may help identify farm fields with similar characteristics for adoption of VRN management.

中文翻译:

基于传感器的可变速率氮肥管理下景观,土壤和天气对产量,氮素利用和盈利能力的影响

由于利润不确定,农民可能不愿意采用可变速率氮(VRN)管理。这项研究评估了田间景观,土壤和天气对基于光学传感(OS)的VRN在棉花上的影响(陆地棉)L.)N个利率,收益率和净收益率(NRs)。在2011年至2014年之间,从位于路易斯安那州,密西西比州,密苏里州和美国田纳西州的21个地点收集了实地数据。数据包括农民实践(FP),基于OS的VRN和基于OS的产量,N速率和NR。 VRN补充了其他信息。生产数据增加了景观,土壤和天气数据,ANOVA和逻辑回归用于确定VRN有利可图,提供风险管理收益和提高氮效率的田间条件。关键发现表明,通过在更易腐蚀的土壤上添加其他N,VRN可以改善NR。高有机质土壤还通过提高产量和增施NRs而从VRN中受益。VRN还可能通过在土壤中提供较低的NR低于FP的NR来提供风险管理收益,这与更大的持水能力,更高的有机质含量或更深的剖面相关。这项研究的结果可能有助于确定具有类似特征的农田,以便采用VRN管理。
更新日期:2020-11-25
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